I have a rear end for my 63 falcon and I need to find out the size differential to put in. I think it was from a truck and cut to size. there is a small label that reads 7D1 and also D5AWB if that means anything. The gears load into the housing with the axles and there is an inspection cover facing the rear

If there is a D5AW stamping on the center section, it would have to be a mid-seventies housing out of a Galaxy/LTD. There were only two styles then...9" and 8.7". Seeing as yours has a rear cover, it has to be the 8.7" (8.8") The 7.5" didn't appear until 1979.

Late Note: This style was also used on the Granada of that period. It is hard to ascertain from component I.D. nos. as these were used on more than one type of assembly and/or car line. If the assembly tag is missing, complete teardown may be necessary to properly identify the assembly.

This is just an educated guess with the information you have supplied mind 'ya...

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